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GAS DELIVERY SYSTEM (continued)
For non-liquefied gases (O
indicated pressure is proportional to the
gas content of the cylinder. For liquefied
gases (N
O, CO
) the gauge indicates the
2
2
vapor pressure of the liquefied gas in the
cylinder. This pressure remains constant
until all of the liquid in the cylinder has
vaporized. When the liquid has vaporized,
the
cylinder
pressure
proportionally with further removal of gas
from the cylinder.
NOTE: If two reserve cylinders of the same
gas are open at the same time, the cylinder
pressure gauge will indicate the pressure
in the cylinder having the higher pressure.
Pipeline Pressure Gauges
Pipeline pressure gauges for oxygen and
nitrous oxide are standard (Figures 5, 6, &
7). If the anesthesia machine is equipped
with air, a pipeline pressure gauge for air
is also included.
10
, Air, O
-He) the
2
2
decreases
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These gauges are located directly below
their corresponding flowmeters and flow
control valves, and are labeled and color-
coded for their respective gases. Concentric
scales in psi and kPa indicate the delivered
pipeline
supply
pressure.
machine is connected to a functioning
pipeline supply, each gauge should indicate
50-55 psi. A deviation from within this
range indicates an improperly adjusted
pipeline gas supply system and may
adversely affect the operation of the
NARKOMED 3.
A fluctuating pipeline supply pressure, for
example, would cause a corresponding
fluctuation of the delivered flow of that
gas. An excessively low pipeline pressure
may activate the corresponding reserve
cylinder and deplete its contents (if the
reserve cylinder valve was left in the open
position).
Carbon dioxide and oxygen-helium mixture
supplies for NARKOMED 3 machines are
provided exclusively from cylinders. Thus,
these gases do not require pipeline
pressure gauges.
When
the
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